Uploading a file to AWS S3 using aws-sdk-go

upload-file-s3.go

/*
	https://www.youtube.com/watch?v=iOGIKG3EptI
	https://github.com/awslabs/aws-go-wordfreq-sample/blob/master/cmd/uploads3/main.go
	
	https://docs.aws.amazon.com/sdk-for-go/api/aws/

	- first configure your aws credentials run: aws configure
	- go get -u github.com/aws/aws-sdk-go/aws
	- login to UI web aws s3 interface
	- go to S3 service
	- create a Bucket called com.example in the desired region (I used Oregon us-west-2)
	- run:   go run main.go com.example fileToUpload
*/

package main

import (
	"fmt"
	"os"
	"path/filepath"

	"github.com/aws/aws-sdk-go/aws"
	"github.com/aws/aws-sdk-go/aws/session"
	"github.com/aws/aws-sdk-go/service/s3/s3manager"
)

func main() {
	if len(os.Args) != 3 {
		fmt.Printf("usage: %s <bucket> <filename>\n", filepath.Base(os.Args[0]))
		os.Exit(1)
	}

	bucket := os.Args[1]
	filename := os.Args[2]

	file, err := os.Open(filename)
	if err != nil {
		fmt.Println("Failed to open file", filename, err)
		os.Exit(1)
	}
	defer file.Close()

	//select Region to use.
	conf := aws.Config{Region: aws.String("us-west-2")}
	sess := session.New(&conf)
	svc := s3manager.NewUploader(sess)

	fmt.Println("Uploading file to S3...")
	result, err := svc.Upload(&s3manager.UploadInput{
		Bucket: aws.String(bucket),
		Key:    aws.String(filepath.Base(filename)),
		Body:   file,
	})
	if err != nil {
		fmt.Println("error", err)
		os.Exit(1)
	}

	fmt.Printf("Successfully uploaded %s to %s\n", filename, result.Location)
}